The British singer has been offered £50,000 a minute to headline a music festival in Norway, but he is unsure whether to accept as he has vowed to give up touring.

A friend of Williams is reported as saying: "It would probably be the easiest money he'll make in his life but it's touch and go whether he'll say yes. We'll have to wait and see."

The 34-year-old recently posted a blog message saying he has no wish to return to live shows because his last tour "nearly killed" him. He wrote: "The more time I'm spending away from public life, the more I like it."

Despite the massive offer, Williams is not the only artist who commands preposterous fees, especially for private shows.

- The Rolling Stones reportedly charge £4 million (US $8 million) per show, making them the most expensive music act in the world.

- The Eagles come a close second, charging £3.75 million ($7.5 million).

- Celine Dion allegedly demands almost $7 million for a private show. We don't know if that includes the worst cover version ever.

- Sir Elton John asked one British multi-millionaire to pay him £1 million (US $2 million) to play at his wedding reception. And he's reportedly set for a $5.2 million payday in Russia this autumn.

- 50 Cent demands £250,000 (US $500,000) to perform at a private party. 'Fiddy' told Blender magazine: "The last bar mitzvah I booked, I got paid half a million for 30 minutes. That's not a fixed rate, but it's in the ballpark."

- Amy Winehouse was recently reported to get US $2 million for a private show in Moscow for the girlfriend of billionaire Roman Abramovich.

- Beyoncé Knowles is cheap-ish at just £650,000 (US $1.3 million).

- And Aerosmith will entertain you for £550,000 (US $1.1 million).

Meanwhile, The MusicRadar house band is available for a plate of nice sausage rolls and some free strings. And we promise not to play Angels.